X = [ 
       -5.00000
       -5.00000
       -5.00000
       -3.33333
       -3.54229
       -3.62054
       -1.66667
       -2.08519
       -2.24230
        0.00000
       -0.63295
       -0.87376
        1.66667
        0.79893
        0.45404
        3.33333
        2.16154
        1.64329
        5.00000
        3.35787
        2.50000
] 

Y = [ 
       -5.00000
       -3.35253
       -2.49186
       -5.00000
       -3.35681
       -2.50000
       -5.00000
       -3.35702
       -2.50000
       -5.00000
       -3.35723
       -2.50000
       -5.00000
       -3.35744
       -2.50000
       -5.00000
       -3.35766
       -2.50000
       -5.00000
       -3.35787
       -2.50000
] 

Z = [ 
       -5.00000
       -3.35253
       -2.49186
       -5.00000
       -3.35681
       -2.50000
       -5.00000
       -3.35702
       -2.50000
       -5.00000
       -3.35723
       -2.50000
       -5.00000
       -3.35744
       -2.50000
       -5.00000
       -3.35766
       -2.50000
       -5.00000
       -3.35787
       -2.50000
] 

C = [ 
         1     2     5; 
         1     5     4; 
         2     3     6; 
         2     6     5; 
         4     5     8; 
         4     8     7; 
         5     6     9; 
         5     9     8; 
         7     8    11; 
         7    11    10; 
         8     9    12; 
         8    12    11; 
        10    11    14; 
        10    14    13; 
        11    12    15; 
        11    15    14; 
        13    14    17; 
        13    17    16; 
        14    15    18; 
        14    18    17; 
        16    17    20; 
        16    20    19; 
        17    18    21; 
        17    21    20; 
] 

trisurf (C, X, Y, Z)
hold on 

